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Fabrication of Low Cost 3-Axis Cnc Router International Journal of Engineering Science Invention ISSN (Online): 2319 – 6734, ISSN (Print): 2319 – 6726 www.ijesi.org Volume 3 Issue 6ǁ June 2014 ǁ PP.01-10 Fabrication of Low Cost 3-Axis Cnc Router Dr.B.Jayachandraiah1, O.Vamsi Krishna2, P.Abdullah Khan3, R.Ananda Reddy4 Prof of M.E &Vice-Principal1, B.Tech, Mechatronics Engineering2, B.Tech, Mechatronics Engineering3, B.Tech, Mechatronics Engineering4 Department of Mechanical Engineering SriKalahateeswara Institute of Technology, Srikalahasti,A.P, India ABSTRACT : Increase in the rapid growth of Technology significantly increased the usage and utilization of CNC systems in industries but at considerable expensive. The idea on fabrication of low cost CNC Router came forward to reduce the cost and complexity in CNC systems. This paper discusses the development of a low cost CNC router which is capable of 3-axis simultaneous interpolated operation. The lower cost is achieved by incorporating the features of a standard PC interface with micro-controller based CNC system in an Arduino based embedded system. The system also features an offline G-Code parser and then interpreted on the micro- controller from a USB. Improved procedures are employed in the system to reduce the computational overheads in controlling a 3-axis CNC machine, while avoiding any loss in overall system performance. I. INTRODUCTION: In modern CNC systems, end-to-end component design is highly automated using computer-aided design (CAD) and computer-aided manufacturing (CAM) programs. The programs produce a computer file that is interpreted to extract the commands needed to operate a particular machine via a post processor, and then loaded into the CNC machines for production. Since any particular component might require the use of a number of different tools – drills, saws, etc., modern machines often combine multiple tools into a single "cell". In other installations, a number of different machines are used with an external controller and human or robotic operators that move the component from machine to machine. In either case, the series of steps needed to produce any part is highly automated and produces a part that closely matches the original CAD design. With the on-going development of technology and economy, new industrial requirements such as high precision, good quality, high production rates and low production costs are increasingly demanded. Most of such requirements, including dimensional accuracy, conformance to tolerances of finished products and production rate can be met with better machine tools. With the help of CNC technology, machine tools today are not limited to human capabilities and are able to make ultra-precision products down to nano scales in a much faster manner. The traditional design philosophy of machine tools is multifunctionality and highest precision possible. However, with the dramatic increase of industry varieties and the growing demand of miniature products, these general purpose machine tools are not efficient, either in terms of machine time or cost, in manufacturing products with special sizes and precision requirements.There are several advantages of using small machines to produce small sized objects. With a smaller machine size, space is saved. The energy required to operate the machine is reduced as well. It now requires less material and components to make the machine, hence bringing down the cost greatly. The weight of moving component also comes down so that during operation, the vibration and noise, as well as pollution to the environment, are markedly reduced. As the machine becomes denser and lighter, it becomes more portable. The layout of the manufacturing plant can be more flexible. The productivity and manufacturing speed also increases due to possible faster operation. II. LITERATURE REVIEW: several authors have studied the development of such machines on a smaller, low-cost scale. Yung C. Shin, Henry Chin, Michael J. Brink, Studied the Characterization of CNC machining centers,‖ Journal ofManufacturing Systems,1991.Heisel. M Kumar, V Puttige,worked on low cost automation for CNC machining center and publishe paper at IJMET, Vol. 3.I. Pahole, L. Rataj, M. Ficko, S. Klancnik, S.Brezovnik, M. Brezocnik, and J. Balic,did research on the "Construction and evaluation of low-cost tableCNC milling machine",2009. V.K. Pabolu and K.N.H. Srinivas,made a design of Low Cost CNC and published a journal on "Design and implementation of a three dimensional CNC machine",2010.T. Andrei and I. Nae, did the workout on "Practical applications performed by a stepper motor CNC router",2010. P.A. Sherring da Rocha Jr., R.D.S. Souza, and M.Emilia de Lima Tostes, "Prototype CNC machinedesign",2012. X. Xu, Y. Li, J. Sun, and S. Wang, "Research and development of open CNC system based on PC and motion controller",2012.. A LOW- COST BUILD-YOUR-OWN THREE AXIS CNC MILL PROTOTYPE, www.ijesi.org 1 | Page Fabrication Of Low Cost 3-Axis… Sundar Pandian and 2S. Raj Pandian 2013. Open source GCODE interpreter code GRBL controller Firmware Code By Ben is the inspiration for working on the low cost production system. The GRBL team implemented user friendly innovation on interpreting the CNC GCODEs using arduino based microcontroller system. III. OBJECTIVE OFPAPER: The idea behind fabrication of low cost CNC router is to full fill the demand of CNC routers from small scale to large scale industries with optimized low cost. A major new development in computer technology is the availability of low-cost open source hardware, such as the Arduino microcontroller. An advantage of open source hardware is that a wide variety of ready-to-use software is available for them on the Web, therefore the prototyping and development times are drastically reduced. Moreover, a wide range of low-cost interfaces, sensors, and accessories such as Arduino shields are also available.. However, for the development of low-cost educational models of CNC machines, such tools may be quite adequate from the viewpoint of machine control. In this paper, the development of a prototype 3-axis CNC Router using Arduino-based control system is presented with following specifications: • Low cost • Easily operable • Easy interface • Flexible • Low power consumption IV. EXPERIMENTAL SETUP: Machine structure is the “backbone” of the machine tool. It integrates all machine components into a complete system. The machine structure is crucial to the performance of the machine tools since it is directly affecting the static and dynamic stiffness, as well as the damping response of the machine tool. A carefully designed structure can provide high stiffness, result in higher operation bandwidth and more precise operation. A small-scale machine tool generally requires even higher stiffness than the ordinary large-scale machine tool since it is usually operated at higher speeds. Granty style closed frame structure is chosen for our experimental setup which provides a strong ridged structure loop, symmetry, and good thermal stability, which provides better stiffness than the open frame structures generally used for easy access to the work zone, with the same order-of-magnitude in size. Closed frame structures typically are used in precision machines such. Therefore it is much easier to move the tool with respect to a fixed work piece. This structure consumes less material, hence is very less expensive to build.Most machines designed for cutting flat steel plate use a gantry design because it is an easy way to move cutting tools in an Z-X coordinate system. The rail system that the gantry rides on forms one axis, usually the Z-axis. The gantry bridge itself forms the other axis, usually the Y-axis. By motorizing each axis and coordinating the motion of the two axes simultaneously, you can move a torch in any pattern necessary to cut shapes out of steel plate. Thus, a gantry design lends itself to CNC shape cutting, which primarily uses an Z-X coordinate system for programming parts.A gantry cutting machine will ride on some sort of rail system in the Z-axis, either floor mounted, pedestal mounted, or sometimes integrated onto the side of a table. The rails are designed to provide accurate motion for the machine, and are strong enough to support the weight of the entire machine and all of the equipment mounted to it. Depending on the size of the machine, these rails can be as simple as a small strip of metal, or as complex as a recirculating ball bearing linear rail system, or as large as a railroad train rail.A gantry cutting machine will also have some sort of guiding system in the X-axis too, which is mounted to the bridge structure itself. The X-axis guiding system will usually be smaller than the Z-axis rails, because they only have to carry the weight of a small carriage and cutting tool, not the entire gantry. Gantry machines may have one tool carriage or many tool carriages. Some times the tool carriages will each have their own drive motor that moves them in the X-axis, and some times there will be only one motor that drives the X-axis, and all of the tool carriages will be connected together by a steel band, tie rod, wire rope, or similar mechanical device. www.ijesi.org 2 | Page Fabrication Of Low Cost 3-Axis… 4.1 STRUCTURAL DESIGN – CAD MODEL Fig.1., 3D WIREFRAME MODEL Fig.2.,3D SOLID MODEL 4.2 DESCRIPTION OF COMPONENTS: 4.2.1 BALL/ LEAD SCREWS A ball screw is a mechanical linear actuator that translates rotational motion to linear motion with little friction. A threaded shaft provides a helical raceway for ball bearings which act as a precision screw. As well as being able to apply or withstand high thrust loads, they can do so with minimum internal friction.
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